public class Demo1 {
    private  static  int sum1=0;
    public static int sum2=0;
    public static void main(String[] args) throws InterruptedException{
        int [] arr=new int[10000];
        for (int i = 0; i < arr.length; i++) {
            arr[i]=i+1;
        }
        Thread t1=new Thread(()->{
            for (int i = 0; i < arr.length; i+=2) {
                sum1+=arr[i];
            }
        });

        Thread t2=new Thread(()->{
            for (int i = 1; i < arr.length; i+=2) {
                sum2+=arr[i];
            }
        });
        t1.start();
        t1.join();
        t2.start();
        t2.join();



//
//        System.out.println("sum1="+sum1);
//        System.out.println("sum2="+sum2);
//        System.out.println("(sum1+sum2) ="+(sum1+sum2));


    }
}
